Lister plow attachment for tractors



June 23, 1936. M. c. THOMAS LISTER PLOW ATTACHMENT FOR TRACTORS Filed July 16, 1955 2 sheets-sheet 1 June 23, 1936. c THOMAS 2,045,209

LISTER PLOW ATTACHMENT FOR TRACTORS Filed July 16, 1955 2 Sheets-Sheet 2 I Patented June 23, 1936 units!) STATES rAT-ENT o error:

LISTER PLOW ATTACHMENT FOR TRACTORS 1 Claim.

This invention relatesto .lister plows and more particularly to an attachment of this character which maybe applied to a tractor.

An object of this invention is to provide an attachment of this character which is so constructedthat it may be quickly applied-and. removed from a conventional :tractor and which embodies operating means for the plows which can be readily graspedby the operator when positioned on the usual seat provided on thetractor.

A'furtherobject of this invention is to provide a construction of this character which maybe coupled with the power take-off of the tractor so as to-raise the lister plow structure off of the ground in order to conveniently move the device.

The above and various other objects and advantages of this invention will in part be described in, and in part be understood fromthe following detail description of thepresentpreferred embodiment, the'same being illustrated in the accompanying drawings, wherein:

Figure 1 is a longitudinalsection partlypindetail of a device constructed according to an embodiment of this-invention, showing the device in applied position on a tractor.

Figure 2 is a fragmentaryperspective view of the attachment.

Referring to the drawings, wherein likenumerals of reference designate corresponding parts throughout the several views, the numeral J designates generally 'a'conventional tractor structure including a frame ll, rear wheels l3, and a power take-01f l2. The tractor [0 herein disclosed is only a conventional type of tractor and it will, therefore, be understood that the hereinafter described lister attachment may be applied to other types of tractors.

In order to provide a lister plow attachment which may be easily and quickly attached and detached from the tractor I0, I have provided a frame structure including a front frame bar l4 and-a rear frame bar I5. These bars l4 and I5 are substantially parallel with each other and disposed in spaced apart relation and, in the present instance, are constructed of angle material.

A pair of lister plow beams l6 and I! are disposed one adjacent each end of the transverse bars l4 and Hi. The beam I6 is pivotally secured at its front end between a pair of angle brackets l8 and is secured adjacent its rear end and on the curved downwardly extending part l9 between a pair of angle brackets 20. The beam I! at its front end is secured between a pair of angle members 2| and the beam I l on the curved downwardly extendingpartifl is secured to-the opposite end of the bar .between a pair of brackets or L-shaped :mernbers 2.3.

A pair of forwardlyextending bars 24 and '25 are secured to the front frame bar l4, one ad- 5 jacent each end, and extend forwardly of the frame structure including the bars I4 and I5 and the beams l6 anol'l'l. The front ends of the'bars 24 and 25 are detachably secured toupstanding brackets .25 disposed one on each side of the i0 tractor frame H at'the front end thereof. Preferably, the front ends of the draw bars 24rand 25am threaded anda nut .21 is threaded on to the forward end. of the draw bar .24, as shown'in Figure 1. 15

The tractor Iii is provided on-the gearhousing 28 thereof with a bracket 2 9 which ;is usually fixedly secured *tolthe'housing ie so that various attachments may be applied to "the tractor. A draw bar 30 is secured to the bracket '29=and, in the present instance,:this draw bar 3!} is reversed and extends forwardlyof the bracket 29 and 'is securedatitsforward end tothe front frame bar l4. The front end of the lister 'frame structure is, therefore, supported by 'means of the draw 25 bars.24,'25:and'30.

A pair-of beams 3| :and 32 are disposed'between the outer lister plowbeams lfi and H and are adapted to be disposed closely adjacent the wheels l3 of the tractor, preferably, on'the outer sides 30 of the wheels-I3 with the wheels l3- disposed be tween "the front bar l4-and the-rear bar l'5. A pair of shafts 33 and 34 are journaled in bearings carried by the lister plow beams, the shaft 33 being journaled in bearings 35 and 36 carried 35 by the beams 3| and I6, respectively. The shaft 34 is journaled in bearings 31 and 38 secured to the beams 32 and 11, respectively. The shafts 33 and 34 each have bell crank portions 39 and 40, respectively and a spindle 4| is secured to the crank 35, whereas a spindle 42 is secured to the crank and suitable wheels 43 may be mounted on the spindles 4| and 42.

The shafts 33 and 34 are held against rotation so as to maintain the bell crank portions 39 and 40 in desired position to maintain the plows 44 attached to the lower ends of the beams in either operative or inoperative position, by means of levers 45 and 46. The lever 46 is secured to the inner end of the shaft 33 and is provided with a plurality of spaced apart openings 41 in which a link 48 engages. This link 48 is secured at its front end to an adjusting lever 49 which is pivoted, as at 50, to the beam 3|. A rack bar 5| is secured to the beam 3| and the lever 49 is adapted to engage this rack bar so as to hold the shaft 33 in its adjusted position. Preferably, the lever 49 is split intermediate its ends and secured as by a plate 52 so that the long end of the lever 49 may be lowered to inoperative position and thereby permit the positioning of the lister frame structure in a relatively small or low place.

The lever 46 is rocked by a link 53, which is secured at its front end to an adjusting lever 54, pivoted as at to the beam 32. This lever 54 has a spring pressed pawl 56 engaging the teeth of a rack bar 51 so as to hold the lever 46 and the shaft 34 in adjusted position. This lever 54 is split after the manner of the lever 49 so that the upper portion thereof may be rocked downwardly, this being accomplished through a plate 58 which is secured to the two portions of the lever 54, as by bolts or the like.

The rear frame I5 is braced against longitudinal bending by means of bracing bars 59 and 50 which have turnbuckles GI and 62 respectively, so that the bars 59 and may be suitably tightened. Preferably, the bars 59 and 59 are held in spaced apart relation from the frame bar l5 by means of bracing members 53 and 64, respectively.

The lister frame structure hereinbefore described may be raised to inoperative position by means of flexible members 55 which are secured at their lower ends to hooks 66 carried by the beams 3i and 32 and the upper or forward ends of the flexible members are secured to rock levers 61 carried by a rock shaft 58 which is mounted on a bearing 69. The bearing 59 is fastened to the axle housing 18 of the tractor ill by means of a bracket or plate H. A second rock lever 12 is secured to the shaft 68 and extends rearwardly of the axle housing 15. The lever 12 has a link 13 connected thereto and this link is connected to a rock lever 14 carried by the power take-off shaft [2. The forward end of the frame is also secured to the frame ll of the tractor by means of a bar 16 which is disposed in a vertical position and is secured at its lower end to the front bar l2 and has its upper end secured as by bolts or the like to the frame I I of the tractor.

In the use and operation of this device, the frame structure hereinbefore described is mounted by disposing the forward frame bar E4 on the ground and then backing the rear wheels 13 of the tractor l0 over the frame member l4 so that the rear wheels [3 will be disposed between the inner beam members 3| and 32. The draw bars 24, 25, and 30 are then secured to the tractor so as to support the forward end of the lister frame. If desired, suitable seed planting devices may be attached to rearwardly extending brackets 15 carried by the rear frame bar l5. The depth of the low members 44 carried by the beams is adjusted by the adjusting levers 49 and 54 which rock the shafts 33 and 34.

Due to the fact that the rear portion of the tractor I0 is disposed within the frame structure, the operator of the device can readily determine the condition of the seed hoppers which may be attached to the brackets 15. When it is desired to raise the plow structure so as to facilitate movement of the device over the ground, this may be accomplished by operating the power take-off l2 so as to raise the lever 14 which will rock the lever 61 upwardly. This will raise the rear portion of the lister frame structure completely off of the ground although it will, of course, be understood that the plow members 44 attached to the rear ends of the beams may be raised off of the ground by rocking of the levers 49 and 54.

It will be apparent from the foregoing that a lister plow structure has been disclosed which can be quickly attached to a conventional tractor and that this lister plow structure will not require an undue amount of power in the use thereof.

I claim:--

A lister plow attachment for tractors comprising a front frame bar, a rear frame bar parallel with the front bar, a plurality of spaced apart plow beams between the frame bars, means for pivotally securing the front ends of the beams to the front bar, means for fixedly securing the rear portions of the beams to the rear bar, a pair of alined shafts provided with bell crank outer end portions, wheels carried by said outer end portions, lever means connected to the inner ends of the shafts to raise or lower the rear ends of the plow beams, a pair of forwardly extending rods secured at their rear ends to the front frame bar, means at the front ends of said rods for securing the rods to the front portion of the tractor, a pair of apertured bars secured at one end to the front frame bar, and brackets adapted to be secured to the tractor adjacent the rear thereof and adapted to be secured to said apertured bars in a selected aperture.

MARION CLAUDE THOMAS. 

